tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1// SPDX-License-Identifier: (GPL-2.0+ OR BSD-3-Clause)
2/*
3 * Shared descriptors for ahash algorithms
4 *
5 * Copyright 2017 NXP
6 */
7
8#include "compat.h"
9#include "desc_constr.h"
10#include "caamhash_desc.h"
11
12/**
13 * cnstr_shdsc_ahash - ahash shared descriptor
14 * @desc: pointer to buffer used for descriptor construction
15 * @adata: pointer to authentication transform definitions.
16 * A split key is required for SEC Era < 6; the size of the split key
17 * is specified in this case.
18 * Valid algorithm values - one of OP_ALG_ALGSEL_{MD5, SHA1, SHA224,
19 * SHA256, SHA384, SHA512}.
20 * @state: algorithm state OP_ALG_AS_{INIT, FINALIZE, INITFINALIZE, UPDATE}
21 * @digestsize: algorithm's digest size
22 * @ctx_len: size of Context Register
23 * @import_ctx: true if previous Context Register needs to be restored
24 * must be true for ahash update and final
25 * must be false for for ahash first and digest
26 * @era: SEC Era
27 */
28void cnstr_shdsc_ahash(u32 * const desc, struct alginfo *adata, u32 state,
29 int digestsize, int ctx_len, bool import_ctx, int era)
30{
31 u32 op = adata->algtype;
32
33 init_sh_desc(desc, HDR_SHARE_SERIAL);
34
35 /* Append key if it has been set; ahash update excluded */
36 if (state != OP_ALG_AS_UPDATE && adata->keylen) {
37 u32 *skip_key_load;
38
39 /* Skip key loading if already shared */
40 skip_key_load = append_jump(desc, JUMP_JSL | JUMP_TEST_ALL |
41 JUMP_COND_SHRD);
42
43 if (era < 6)
44 append_key_as_imm(desc, adata->key_virt,
45 adata->keylen_pad,
46 adata->keylen, CLASS_2 |
47 KEY_DEST_MDHA_SPLIT | KEY_ENC);
48 else
49 append_proto_dkp(desc, adata);
50
51 set_jump_tgt_here(desc, skip_key_load);
52
53 op |= OP_ALG_AAI_HMAC_PRECOMP;
54 }
55
56 /* If needed, import context from software */
57 if (import_ctx)
58 append_seq_load(desc, ctx_len, LDST_CLASS_2_CCB |
59 LDST_SRCDST_BYTE_CONTEXT);
60
61 /* Class 2 operation */
62 append_operation(desc, op | state | OP_ALG_ENCRYPT);
63
64 /*
65 * Load from buf and/or src and write to req->result or state->context
66 * Calculate remaining bytes to read
67 */
68 append_math_add(desc, VARSEQINLEN, SEQINLEN, REG0, CAAM_CMD_SZ);
69 /* Read remaining bytes */
70 append_seq_fifo_load(desc, 0, FIFOLD_CLASS_CLASS2 | FIFOLD_TYPE_LAST2 |
71 FIFOLD_TYPE_MSG | KEY_VLF);
72 /* Store class2 context bytes */
73 append_seq_store(desc, digestsize, LDST_CLASS_2_CCB |
74 LDST_SRCDST_BYTE_CONTEXT);
75}
76EXPORT_SYMBOL(cnstr_shdsc_ahash);
77
78MODULE_LICENSE("Dual BSD/GPL");
79MODULE_DESCRIPTION("FSL CAAM ahash descriptors support");
80MODULE_AUTHOR("NXP Semiconductors");